Evolution of a laser shock peened residual stress field locally with foreign object damage and subsequent fatigue crack growth
TLDR
In this article, the non-uniform steep residual stress profile arising from FOD of laser peened aerofoil leading edges varies as a function of fatigue crack growth under high cycle fatigue and mixed high and low cycle fatigue conditions.About:
This article is published in Acta Materialia.The article was published on 2015-01-15 and is currently open access. It has received 99 citations till now. The article focuses on the topics: Stress concentration & Crack closure.read more
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The imaging of failure in structural materials by synchrotron radiation X-ray microtomography
TL;DR: A review of the application of synchrotron radiation X-ray computed microtomography (SR-μCT) to the study of internal damage accumulation and evolution in structural materials including cast irons and steel, nickel superalloys, lightweight titanium and aluminum alloys as well as metallic, ceramic and polymer composite materials together with additatively manufactured or three-dimensional (3D) printed metallic materials can be found in this paper.
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Effects of low-temperature transformation and transformation-induced plasticity on weld residual stresses: Numerical study and neutron diffraction measurement
TL;DR: In this paper, the weld residual stresses (RS) in a 25mm thick ferrite steel plate with newly developed low-temperature transformation (LTT) welding wire were investigated by finite element method and neutron diffraction (ND) measurement.
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Surface nanocrystallization of metallic alloys with different stacking fault energy induced by laser shock processing
TL;DR: In this article, two typical alloys of TC6 titanium alloy and AISI 304 stainless steel were taken to study the surface nanocrystallization process, and the surface microstructures were characterized by transmission electron microscope (TEM) and electron back scattered diffraction (EBSD).
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Regain the fatigue strength of laser additive manufactured Ti alloy via laser shock peening
TL;DR: In this paper, the surface and profile residual stress distributions were presented on laser additive TC17 titanium alloy with and without laser shock peening (LSP) treatment, and the microhardness and tensile properties of the laser additive specimens were presented and compared before and after LSP treatment.
References
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Laser shock processing and its effects on microstructure and properties of metal alloys: a review
TL;DR: In this paper, the current status of research and development on laser shock processing of metals, also known as laser peening, using Q-switched high power lasers is reviewed and the influence of processing parameters on the laser-induced shock waves in metal components are discussed and analyzed.
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Residual stress and its role in failure
TL;DR: In this article, the origins of residual stress are understood, opportunities for removing harmful or introducing beneficial residual stresses recognized, their evolution in-service predicted, their influence on failure processes understood and safe structural integrity assessments made, so as to either remove the part prior to failure, or to take corrective action to extend life.
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An evaluation of shot peening, residual stress and stress relaxation on the fatigue life of AISI 4340 steel
TL;DR: In this article, the authors evaluated the fatigue life of AISI 4340 steel, used in landing gear, under four shot peening conditions and found that relaxation of the residual stress field occurred due to the fatigue process.
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On the influence of mechanical surface treatments—deep rolling and laser shock peening—on the fatigue behavior of Ti–6Al–4V at ambient and elevated temperatures
TL;DR: In this paper, the effect of DR on the low-cycle fatigue (LCF) and high cycle fatigue (HCF) behavior of a Ti-6Al-4V alloy is examined, with particular emphasis on the thermal and mechanical stability of the residual stress states and the near-surface microstructures.